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6 papers · 2 filters
Theoretical studies of the phase transition in the anisotropic 2-D square spin lattice
Mohamad Al Hajj, Nathalie Guihery, Jean-Paul Malrieu +1
The phase transition occurring in a square 2-D spin lattice governed by an anisotropic Heisenberg Hamiltonian has been studied according to two recently proposed methods. The first…
Phase transitions in the Shastry-Sutherland lattice
Mohamad Al Hajj, Jean-Paul Malrieu
Two recently developed theoretical approaches are applied to the Shastry-Sutherland lattice, varying the ratio between the couplings on the square lattice and on the oblique…
A renormalized excitonic method in terms of block excitations. Application to spin lattices
Mohamad Al Hajj, Jean-Paul Malrieu, Nathalie Guihéry
Dividing the lattice into blocks with singlet ground state and knowing the exact low energy spectrum of the blocks and of dimers (or trimers) of blocks, it is possible to approach…
Numerical Contractor Renormalization Method for Quantum Spin Models
Sylvain Capponi, Andreas Laeuchli, Matthieu Mambrini
We demonstrate the utility of the numerical Contractor Renormalization (CORE) method for quantum spin systems by studying one and two dimensional model cases. Our approach consists…
Enhanced pairing in doped quantum magnets with frustrating hole motion
Didier Poilblanc
Evidence for strong pairing at arbitrary small J/t is provided in a t-J model on the checkerboard lattice for the sign of hopping leading to frustration in hole motion. Destructive…
Current Carrying Ground State in a Bi-layer Model
Sylvain Capponi, Congjun Wu, Shou-Cheng Zhang
Strongly interacting systems have been conjectured to spontaneously develop current carrying ground states under certain conditions. We conclusively demonstrate the existence of a…